take: Add snap id to error message.
take: Add snap id to error message.

When the program fails in `take` command waiting for the snapshot to
complete it fails with this error:

```
take: error getting snapshot preproduction record not found
```

It shows `*destination` which is the repository where the snapshot is
being stored but does not show what was the expected id of the snap,
a date string calculated.

This commit adds the date to the error message for helping debug, this
allows knowing if the command failed because the expected snap was not
there or if a problem in connection interrupted the program but the
snapshot was taken successfully.

bebanjo/esnap